What Are Antibiotics?

Antibiotics are medicines that help stop infections caused by bacteria. They do this by killing the bacteria or by keeping them from copying themselves or reproducing. The word antibiotic means “against life.” Any drug that kills germs in your body is technically an antibiotic. But most people use the term when they’re talking about medicine that is meant to kill bacteria.
Before scientists first discovered antibiotics in the 1920s, many people died from minor bacterial infections, like strep throat. Surgery was riskier, too. But after antibiotics became available in the 1940s, life expectancy increased, surgeries got safer, and people could survive what used to be deadly infections.

What Antibiotics Can and Can’t Do

Most bacteria that live in your body are harmless. Some are even helpful. Still, bacteria can infect almost any organ. Fortunately, antibiotics can usually help.

These are the types of infections that can be treated with antibiotics:

  • Some ear and sinus infections
  • Dental infections
  • Skin infections
  • Meningitis (swelling of the brain and spinal cord)
  • Strep throat
  • Bladder and kidney infections
  • Bacterial pneumonia
  • Whooping cough
Only bacterial infections can be killed with antibiotics. The common cold, flu, most coughs, some bronchitis infections, most sore throats, and the stomach flu are all caused by viruses. Antibiotics won’t work to treat them. Your doctor will tell you to wait for these illnesses out or prescribe antiviral drugs to help you get rid of them. It’s not always obvious whether an infection is viral or bacterial. Sometimes your doctor will do tests before deciding which treatment you need. Some antibiotics work on many different kinds of bacteria. They’re called “broad-spectrum.” Others target specific bacteria only. They’re known as “narrow-spectrum.”

Side Effects

Since your gut is full of bacteria — both good and bad — antibiotics often affect your digestive system while they’re treating an infection. Common side effects include:

  • Vomiting
  • Nausea
  • Diarrhea
  • Bloating or indigestion
  • Abdominal pain
  • Loss of appetite

Occasionally, you may have other symptoms, like:

  • Hives – a raised, itchy skin rash
  • Coughing
  • Wheezing
  • Tight throat or trouble breathing

Ref. https://www.webmd.com/a-to-z-guides/what-are-antibiotics#1

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